Composition for core of gas-check pads.



UNITED STATES PATENT OFFICE.

GREGOR GERDOM, or WATRRVLIET, New YORK, ASSIGNOR TO ORIDN'ANCE IMPROVE-mam: COMPANY, or NEW YORK, N. Y., A CORPORATION OF NEW YORK.

COMPOSITION FOR CORE 0]? GAS-CHECK PADS.

No Drawing.

To all whom it may concern Be it known that I, GREGORY GERoo u, acitizen of the United States, and resident of Watervliet, in the countyof Albany and State of New York, have invented certain new and usefulImprovements in Compositions for Cores of Gas-Check Pads, of which thefollowing is a specification.

My invention relates to improvements in obturators for heavy ordnancewhich comprise a plastic core surrounded and inclosed by a metallic wirecloth; its object being to provide an improved composition for suchcore, and consists in the ingredients and method of compounding the samehereinafter claimed.

It is essential that in an article of this kind the plastic compositionshall be of such character as to withstand without change ordeterioration the greatest possible extremes of both heat and cold,which can occur under service conditions, so that it will never besolidified by cold or softened'by heat to interfere with perfectfunctioning in action.

My improved composition is made up of the following named ingredients:Chinese wood oil, (or tung oil), tallow, petroleum jelly and asbestos.These ingredients I compound in the following preferred manner. I take10 pounds of tung oil and heat it to a temperature of about 400 F atwhich temperature it begins to jelly or thicken. At the same time I mixtogether tallow and petroleum jelly in the proportions of 14 pounds oftallow to 7 pounds of petroleum jelly and heat them to about 400 F.,'then mix and thoroughly stir them with the tung oil and allow to cool. Ithen take 35 pounds of finely shredded asbestos, and 16 pounds of theforegoing described mixture, heat to a temperature of about 250 F. andstir together until thoroughly and uniformly mingled. lVhen cold I forcethis material, preferably twice, through a hydraulic press with narrowvent openings, under a pressure of about 1000 pounds per square inch toreduce the mixture to a dense and homogeneous condition. As many batchesas are necessary for the number of pads to be made are prepared as abovedescribed, all being then mixed together to secure uniformity, and againrun through the press, and afterward through a meat chopper, or similarSpecification of Letters Patent.

Application filed July 10, 1913. Serial No. 778,392.

' machine, to break up the material into pieces a single pad is thenweighed out and placed in a die and subjected to a pressure of about2000 pounds per square inch, and then placed in its coverings, pressedand finished in the usual manner.

While my invention is designed primarily, and would usually beconstructed, with a Wire cloth envelop, yet it is practicalto dispenseentirely with an envelop, the composition being of such character thatitwill make a thoroughly effective, practical and durable pad withoutany covering whatever. Having thus described my invention, what I claimand desire to secure by Letters Patent is:

1. The improved composition of matter comprising tung oil, tallow,petroleum jelly and asbestos, in substantially the proportions of tungoil 10 pounds, tallow 14 pounds, petroleum jelly 7 pounds, asbestos 70pounds.

2; The improved composition of matter comprising a mixture of tung oil,tallow and petroleum jelly, in substantially the proportions of 10pounds of tung oil, 14 pounds of tallow, and 7 pounds of petroleumjelly, which have been heated to a temperature of about 400 F., andfinely shredded asbestos in the proportion of about 35 pounds ofasbestos to 16 pounds of said mixture.

3. The improved method of preparing a plastic core for obturators ofbreech loading ordnance, consisting in first separately heating to atemperature of about 400 F. and then combining in the followingproportions, tung oil 10 pounds, tallow 14 pounds, petroleum jelly 7pounds, and then mixing with this composition 35 pounds of finelyshredded asbestos to 16 pounds of said composition at a temperature ofabout 250 F., then allowing the mass to become cold, and then mixing,compressing and shaping the same while cold into the desired form.

Signed at Albany in the county of Albany and State of New York this 7thday of July, 1913. 1

GREGORY GERDOM.

Witnesses:

JOHN J. MCMANUS, Mrs. CHARLOTTE GERDOM.

